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METHYLARSONIC ACID ICSC: 0755
Date of Peer Review: April 2005

Methanearsonic acid
Monomethylarsinic acid
MMA
Monomethylarsonate
CAS # 124-58-3 CH3AsO(OH)2 / CH5AsO3
RTECS # PA1575000 Molecular mass: 140
UN # 1557
EC # 033-002-00-5
TYPES OF HAZARD / EXPOSURE ACUTE HAZARDS / SYMPTOMS PREVENTION FIRST AID / FIRE FIGHTING
FIRE Not combustible. Gives off irritating or toxic fumes (or gases) in a fire.

In case of fire in the surroundings: all extinguishing agents allowed.
EXPLOSION


EXPOSURE
PREVENT DISPERSION OF DUST! AVOID ALL CONTACT!

Inhalation Cough. Sore throat.
Local exhaust or breathing protection.
Fresh air, rest. Refer for medical attention.
Skin Redness.
Protective gloves.
Remove contaminated clothes. Rinse and then wash skin with water and soap.
Eyes Redness.
Safety goggles, or eye protection in combination with breathing protection if powder.
First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then take to a doctor.
Ingestion Abdominal pain. Diarrhoea. Vomiting.
Do not eat, drink, or smoke during work. Wash hands before eating.
Rinse mouth. Refer for medical attention.
SPILLAGE DISPOSAL PACKAGING & LABELLING
Personal protection: P3 filter respirator for toxic particles. Sweep spilled substance into containers; if appropriate, moisten first to prevent dusting. Carefully collect remainder, then remove to safe place.
Do not transport with food and feedstuffs. Marine pollutant.
EU Classification
Symbol: T, N
R: 23/25-50/53
S: (1/2-)-20/21-28-45-60-61
Note: [A, 1]
UN Classification
UN Hazard Class: 6.1
UN Pack Group: I
EMERGENCY RESPONSE STORAGE
Transport Emergency Card: TEC (R)-61GT5-1
Separated from strong bases, food and feedstuffs. Dry. Store in an area without drain or sewer access.
IPCS
International
Programme on
Chemical Safety
Prepared in the context of cooperation between the International Programme on Chemical Safety and the Commission of the European Communities IPCS, CEC 1999

SEE IMPORTANT INFORMATION ON BACK
METHYLARSONIC ACID ICSC: 0755
IMPORTANT DATA
PHYSICAL STATE; APPEARANCE:
WHITE HYGROSCOPIC SOLID IN VARIOUS FORMS.

CHEMICAL DANGERS:
The substance decomposes on heating producing toxic fumes (arsenic oxides - see ICSC 0378). The solution in water is a medium strong acid.

OCCUPATIONAL EXPOSURE LIMITS:
TLV: BEI issued; (ACGIH 2005).
MAK not established.
ROUTES OF EXPOSURE:
The substance can be absorbed into the body by inhalation of its aerosol and by ingestion.

INHALATION RISK:
A harmful concentration of airborne particles can be reached quickly when dispersed.

EFFECTS OF SHORT-TERM EXPOSURE:
The substance is mildly irritating to the eyes the skin and the respiratory tract. Exposure by ingestion may result in gastroenteritis. Medical observation is indicated.

EFFECTS OF LONG-TERM OR REPEATED EXPOSURE:
The substance may have effects on the kidneys and liver, resulting in impaired functions. This substance is carcinogenic to humans.
PHYSICAL PROPERTIES
Melting point: 161C
Solubility in water: very good
ENVIRONMENTAL DATA
The substance is toxic to aquatic organisms. This substance does enter the environment under normal use. Great care, however, should be given to avoid any additional release, e.g. through inappropriate disposal.
NOTES
Do NOT take working clothes home. Depending on the degree of exposure, periodic medical examination is suggested. The recommendations on this card also apply to monosodium methanarsonate and disodium methanarsonate.
ADDITIONAL INFORMATION


LEGAL NOTICE Neither the CEC nor the IPCS nor any person acting on behalf of the CEC or the IPCS is responsible for the use which might be made of this information
IPCS, CEC 1999